Yay for technical discussion!
Austin is correct thought, the server base that we use was entirely written from scratch by myself. The tutorial that was posted is for server based off the PI base, which we do not use.
If you want a more technical explanation, our server is based around plugins that run within the game engine that I wrote. For quests, there is a Quests plugin that reads in .RRQ (RuneRebels Quest) files, which are a custom binary format I created that contain quest steps along with dialogue for a quest. The plugin parses these files into actual object code for the server to use.
You guys will actually be able to get your hands on these tools soon and screw around with them.